Two-stroke engines exhaust and scavenge control

Abstract

A system of controlling the exhaust and scavenge process for two-stroke piston engines with crankcase scavenge and fed by air/fuel mixture, which has a rotary valve adjacent to the cylinder exhaust port/s that rotates in synchronism with the crankshaft enabling the control of the exhaust gases initial speed and preventing the air/fuel mixture from leaking to the exhaust system during the compression stroke; this way, the engine power is improved, and the CO and HC emissions and oil and fuel consumption are reduced.

What I claim as my invention is:  
     
         1 . A new system of controlling the exhaust and scavenge process for two-stroke piston engines with crankcase scavenge, of the kind in which the air/fuel mixture is driven into the cylinder during the scavenge stroke, which is characterized by having a rotary valve adjacent to the cylinder exhaust port that rotates in synchronism with the crankshaft  
     
     
         2 . A system of controlling the exhaust and scavenge process as in  claim 1 , characterized by the feature that the rotary valve adjacent to the cylinder exhaust port/s controls the initial speed of exhaust gases when such process begins.  
     
     
         3 . A system of controlling the exhaust and scavenge process as in  claim 1 , characterized by the feature that the rotary valve adjacent to the cylinder exhaust port/s closes such port/s controlling the scavenge process during the engine compression stroke.